<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function copy(target){
   
 return target.slice(0,5)
// return [...target]
}
let arr = [1, 2, 3, 4, 5]

// console.log(arr.slice(0,3));
let brr = copy(arr); 
arr.push(100);
console.log(brr); // [1, 2, 3, 4, 5]
    </script>
</body>
</html>